Formula: Ca4MgAs2B12O22(OH)12.12H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α =1 .526, β = 1.528, γ = 1.551
Bireflectance/Birefringence δ: 0.025
2V angle: 34° (calculated), 33° (measured)
Dispersion: Relatively weak, r > v
Optical orientation: Z = b, X Ù c= -26°
Optical axial plane:
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